Red Child, Eternal Youth
I’ve mentioned it before, but this all might mean that ghouls in general age more rapidly than humans, only it isn’t noticeable because the process is slowed down so vastly by their intake of regenerative RC cells.
If that’s so, it makes sense that the Garden kids are just ghouls who can’t (or are told they can’t) replenish RC cells. That’s why Furuta– who rarely fights and has a synthetic kakuhou– has black hair at the same age Arima’s was almost completely white.
Kaneki made a point when he said that his hair was going black again because he was eating regularly at the CCG and not expending any RC cells. The buildup allowed his hair to regenerate. It also explains why his hair went all black very rapidly after eating Eto’s kakuja (it was a massive influx) and completely white after Yamori and Arima in cochlea (expending his stock too quickly).
And speaking of Eto, I wrote a meta a while ago about her ability as a sort-of “fountain of youth”. It seems like she has a gift of longevity (despite her comments about “getting old”), since her body is constantly replenishing itself on top of cannibalization.
Flowers grow on decomposed materials
She’s also able to “give” her “gift” to others, possibly by depositing parts of herself in others (like when she tore out Banjou’s ribs) and thereby giving them a huge boost in highly-concentrated RC cells.
She’s the opposite of what the Garden kids are.
Plus, the “medicine” being given to Okahira must be the same thing she was telling Amon about.
In essence, it takes tons of ghoul bodies ground down into a liquid to reach a concentration similar to Eto’s. It must be what’s keeping Okahira animated, as well as the black-cloaked V agents*
*Remember, Hirako said they’re like an “advanced” 0 Squad, although they are all clearly much older than Arima.
To create, you must first destroy.
The eggshell has to be broken for the life inside to be born, right? >:)c
So, according to Furuta, I wouldn’t be surprised if these little white-haired husks of the Oggai are able to come back if enough RC cells are pumped back into them. Like @mawjaw said, “death mirrored [the made-up kanji for Oggai] is life”. They do look a lot like yolks running from an eggshell imo.
And even if they don’t come back, this is the beginning of something new.
Hermeticism– the belief system that classical Tarot art is based on– states that the universe is ever being born and recreated on every plane of existence no matter how big or how small. There are no ultimate endings, only new beginnings and so on. Kaneki is Death on legs right now, but the fact that he’s ever-multiplying his stock of RC cells means he’s also the foundation for new life.